] over the years your mouth has sipped, snacked, ...yellowed... lived, loved, ...yellowed... chatted, chewed ...yellowed. and over all those years, your teeth...have yellowed. fact is if you're not whitening you're yellowing. crest 3d white whitestrips remove over ten years of stains by going below the enamel surface. and, they whiten 25 times better than a leading whitening toothpaste. crest whitestrips. life opens up when you do. [♪...] >> i've been training all year for the big race in chicago, but i can only afford one trip. and i just found out my best friend is getting married in l.a.